title: Etiological factors inducing ossification of the posterior longitudinal ligament.
mesh_terms: D000328:Adult; D000368:Aged; D001415:Back; D005260:Female; D006801:Humans; D008022:Ligaments; D008297:Male; D008875:Middle Aged; D009790:Occupations; D009999:Ossification, Heterotopic / Q000209:etiology*; D011187:Posture